1.【Chair Cushions】The size of the donut pillow is 15.3 "x 16.9" x 3.5 ". The surface layer is made of comfortable and breathable fabric, and the core is memory foam. The memory cotton inner core has enough support and resilience, which can make you more comfortable and will maintain shape even after many uses.2.【 Memory Foam】Our cushion is made of durable memory foam that provides superior comfort. It's slow-rebounding and always regains its shape after each use, ensuring long-lasting comfort.3.【Advanced Design】Our seat cushion is made of high-density memory foam. Super soft velvet cover with embroidery for a premium look. The cover is equipped with a smooth zipper and is removable and machine washable. The bottom of the seat cushion has a special non-slip design, so you don't have to worry about the cushion sliding.4.【Fits Most Types of Seats】The seat cushion is suitable for all and matches many kinds of chairs or seats. It provides comfortable support for sedentary people. Whether at home, in the office, in the car, on an airplane, or in a wheelchair. Whether at work or play, the cushion provides a comfortable support for your back and tailbone.5.【 Gift for Sedentary People】Made of pure memory foam, ergonomically designed to conform to your curves, this cushion provides superior comfort and helps relieve muscle fatigue from long periods of sitting. memory foam rebounds quickly and is not prone to distortion.